Filter avectorscope
  Convert input audio to vectorscope video output.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
avectorscope AVOptions:
  mode              <int>        ..FV...... set mode (from 0 to 2) (default lissajous)
     lissajous       0            ..FV...... 
     lissajous_xy    1            ..FV...... 
     polar           2            ..FV...... 
  m                 <int>        ..FV...... set mode (from 0 to 2) (default lissajous)
     lissajous       0            ..FV...... 
     lissajous_xy    1            ..FV...... 
     polar           2            ..FV...... 
  rate              <video_rate> ..FV...... set video rate (default "25")
  r                 <video_rate> ..FV...... set video rate (default "25")
  size              <image_size> ..FV...... set video size (default "400x400")
  s                 <image_size> ..FV...... set video size (default "400x400")
  rc                <int>        ..FV...... set red contrast (from 0 to 255) (default 40)
  gc                <int>        ..FV...... set green contrast (from 0 to 255) (default 160)
  bc                <int>        ..FV...... set blue contrast (from 0 to 255) (default 80)
  ac                <int>        ..FV...... set alpha contrast (from 0 to 255) (default 255)
  rf                <int>        ..FV...... set red fade (from 0 to 255) (default 15)
  gf                <int>        ..FV...... set green fade (from 0 to 255) (default 10)
  bf                <int>        ..FV...... set blue fade (from 0 to 255) (default 5)
  af                <int>        ..FV...... set alpha fade (from 0 to 255) (default 5)
  zoom              <double>     ..FV...... set zoom factor (from 0 to 10) (default 1)
  draw              <int>        ..FV...... set draw mode (from 0 to 1) (default dot)
     dot             0            ..FV...... 
     line            1            ..FV...... 
  scale             <int>        ..FV...... set amplitude scale mode (from 0 to 3) (default lin)
     lin             0            ..FV...... linear
     sqrt            1            ..FV...... square root
     cbrt            2            ..FV...... cube root
     log             3            ..FV...... logarithmic
  swap              <boolean>    ..FV...... swap x axis with y axis (default true)
  mirror            <int>        ..FV...... mirror axis (from 0 to 3) (default none)
     none            0            ..FV...... no mirror
     x               1            ..FV...... mirror x
     y               2            ..FV...... mirror y
     xy              3            ..FV...... mirror both


